Parker D Series User Manual

16
Pilot Operated Prop. DC Valve with VCD
®
Series D*1FP/FE Explosion Proof
Operation Manual
Parker Hannifin Corporation
MSG11-5715-718 D_1FP IECEX UK.indd 19.12.19
6. Operating Instructions
Description
Pilot operated valves of the series D*1FP*ED
and D*1FE*ED are designed for usage in explo-
sion sensitive areas concerning the IECEX/ATEX
specication.
The valve consists of a pilot valve, a main stage
and a position transducer. The subplate mounted
valves are designed for mounting on a hydraulic
block with corresponding mounting pattern.
The main spool controls the hydraulic ow pro-
portionally to a command signal. Below the main
stage are the hydraulic connections, which connect
the valve to the customer’s hydraulic system. The
working ports A and B are connected to the supply
pressure P or T (tank) depending on the polarity of
the input signal at the pilot valve.
The pilot valve is also designed as a spool valve
and positions hydraulically the main spool. Both
spools, of the pilot valve and of the main stage are
position-controlled. The position transducer of the
pilot valve is integrated, the position transducer of
the main stage is mounted outside.
The explosion protection of the complete valve is
realized by the explosion protection at the pilot
valve and at the external position sensor by the
type of protection “ameproof enclosure”.
Configuration and function
The electrical connection of the valve for the power
supply and the setpoint signal occurs via the ter-
minal block, which is located under a removable
connection cap.
The electrical signals are processed in the inte-
grated control electronics.
The electronics include the power amplier for the
voice coil drive of the pilot valve, as well as two
control electronics for the two position transducers
of pilot valve and main stage. The control electron-
ics of the pilot valve compares permanently the
transducer signal with the command signal and
leads the main spool to its exact position.
The spool of the pilot valve pressurizes both sides
of the main spool with hydraulic pressure to reach
and maintain the target position. The position of
the main spool affects which hydraulic connections
of the valve are connected. The stroke of the main
spool is proportional to the input signal and controls
the hydraulic ow through the valve.
The ameproof enclosure of the electronics box
and the external position transducer ensures that
no potential explosion energy can get outside of
the valve.
Spool position at power down/center position
For valves with zero lap spools, distinction
must be made between hydraulic neutral
position and power-down position. Neutral
position is taken at neutral input signal, cor-
responding to zero position of the hydraulic
symbol. When the valve is switched off – no
supply voltage, no enable, current signal
(code S) < 3,8 mA – zero lap valves take the
power down position (approximately 10 %
opening) according to the ordering code. For
valves with overlap spools, neutral position
and power down position are the same (zero
position).
Supply pressure must be ensured before
valve is energized.

Parker D Series Specifications

General

Brand	Parker
Model	D Series
Category	Control Unit
Language	English